loadaddr=0x21000000

U-Boot> usb start
(Re)start USB...
USB:   scanning bus for devices... 2 USB Device(s) found
       scanning bus for storage devices... 1 Storage Device(s) found    
U-Boot> usb info
1: Hub,  USB Revision 1.10
 -  OHCI Root Hub 
 - Class: Hub
 - PacketSize: 8  Configurations: 1
 - Vendor: 0x0000  Product 0x0000 Version 0.0
   Configuration: 1
   - Interfaces: 1 Self Powered 0mA
     Interface: 0
     - Alternate Setting 0, Endpoints: 1
     - Class Hub
     - Endpoint 1 In Interrupt MaxPacket 2 Interval 255ms

2: Mass Storage,  USB Revision 2.0
 - USB Flash Disk 9D785E10
 - Class: (from Interface) Mass Storage
 - PacketSize: 64  Configurations: 1
 - Vendor: 0x058f  Product 0x6387 Version 1.2
   Configuration: 1
   - Interfaces: 1 Bus Powered 100mA
     Interface: 0
     - Alternate Setting 0, Endpoints: 2
     - Class Mass Storage, Transp. SCSI, Bulk only
     - Endpoint 1 Out Bulk MaxPacket 64
     - Endpoint 2 In Bulk MaxPacket 64
U-Boot> usb storage
  Device 0: Vendor: USB      Rev: 8.07 Prod: Flash Disk      
            Type: Removable Hard Disk
            Capacity: 241.0 MB = 0.2 GB (493568 x 512)
U-Boot> fatload usb 0 $(loadaddr) rootfs.ext2.gz.uboot
reading rootfs.ext2.gz.uboot
................................................................................................................................................................................................................................................................................................
......................................................................................................................................................................................................................................................................RomBOOT


U-Boot 2009.11.1 (Aug 27 2013 - 13:43:57)

DRAM:  64 MB
NAND:  256 MiB
In:    serial
Out:   serial
Err:   serial
Net:   macb0
macb0: Starting autonegotiation...
macb0: Autonegotiation complete
macb0: link up, 100Mbps full-duplex (lpa: 0x45e1)
Hit any key to stop autoboot:  0 
U-Boot>    


Environment Variables
"autoload=no\0" \
"console=quiet\0" \
"dbgconsole=console=ttyS0,115200\0" \
"ethaddr=00:01:02:03:04:05\0" \
"loadaddr=0x21000000\0" \
"ramdiskaddr=0x21400000\0" \
"ubootaddr=0x20000\0" \
"ubootsize=0xE0000\0" \
"kerneladdr=0x100000\0" \
"kernelsize=0x400000\0" \
"etcaddr=0x500000\0" \
"etcsize=0x100000\0" \
"rootfsaddr=0x600000\0" \
"rootfssize=0x1000000\0" \

"nandload=nand read.jffs2 $(loadaddr) $(kerneladdr) $(kernelsize); nand read.jffs2 $(ramdiskaddr) $(rootfsaddr) $(rootfssize)\0" \

"flashuboot=tftp $(loadaddr) u-boot.bin; nand erase $(ubootaddr) $(ubootsize); nand write.jffs2 $(loadaddr) $(ubootaddr) $(ubootsize)\0" \

"flashkernel=tftp $(loadaddr) uImage; nand erase $(kerneladdr) $(kernelsize); nand write.jffs2 $(loadaddr) $(kerneladdr) $(kernelsize)\0" \

"flashetc=tftp $(loadaddr) etc.jffs2; nand erase $(etcaddr) $(etcsize); nand write.jffs2 $(loadaddr) $(etcaddr) $(etcsize)\0" \

"flashrootfs=tftp $(loadaddr) rootfs.ext2.gz.uboot; nand erase $(rootfsaddr) $(rootfssize); nand write.jffs2 $(loadaddr) $(rootfsaddr) $(rootfssize)\0" \

"flashall=run flashkernel; run flashetc; run flashrootfs\0" \

"usbgetkernel=fatload usb 0 $(loadaddr) uImage\0" \
"usbkernel= nand erase $(kerneladdr) $(kernelsize); nand write.jffs2 $(loadaddr) $(kerneladdr) $(kernelsize)\0" \

"usbgetetc=fatload usb 0 $(loadaddr) etc.jffs2\0" \
"usbetc=nand erase $(etcaddr) $(etcsize); nand write.jffs2 $(loadaddr) $(etcaddr) $(etcsize)\0" \

"usbgetrootfs=fatload usb 0 $(loadaddr) rootfs.ext2.gz.uboot\0" \
"usbrootfs=nand erase $(rootfsaddr) $(rootfssize); nand write.jffs2 $(loadaddr) $(rootfsaddr) $(rootfssize)\0" \

"usbflash=run usbgetkernel usbkernel usbgetetc usbetc usbgetrootfs usbrootfs\0" \
"memboot=bootm $(loadaddr) $(ramdiskaddr)\0"